[xwiki-users] newbie question - unable to import .xar file

I have downloaded the windows executable version 2.2.2 As part of installation - I opted not to include the default wiki pages After installation, starting the wiki - an empty wiki appears When selecting on Administration space and trying to import xwiki-enterprise-wiki-2.2.2.xar file - I see a message on the panel indicating that there were errors and so no documents were imported (off course I don't know what the errors are) I have tried the same thing when installing 2.2.2 as a standalone war under tomcat.  I have tried using both postgres and SQL Server 2005 and I end up getting the same place as the scenario above The db gets created - I see the empty wiki page but I can not import any .xar files.  I don't see any memory errors in logs - I have the recommended values set for MaxPermSize and max heap Am I doing something incorrect here considering the fact that in all scenarios, I can't import any .xar files I really would like to get my installation running under either Postgres or SQL Server.  At this point, I am getting frustrated. Any help would be highly appreciated